<?php

/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */

/**
 * Image_Graph - PEAR PHP OO Graph Rendering Utility.
 *
 * PHP versions 4 and 5
 *
 * LICENSE: This library is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation; either version 2.1 of the License, or (at your
 * option) any later version. This library is distributed in the hope that it
 * will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty
 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
 * General Public License for more details. You should have received a copy of
 * the GNU Lesser General Public License along with this library; if not, write
 * to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
 * 02111-1307 USA
 *
 * @category   Images
 * @package    Image_Graph
 * @subpackage Marker
 * @author     Jesper Veggerby <pear.nosey@veggerby.dk>
 * @copyright  Copyright (C) 2003, 2004 Jesper Veggerby Hansen
 * @license    http://www.gnu.org/copyleft/lesser.html  LGPL License 2.1
 * @link       http://pear.php.net/package/Image_Graph
 */

/**
 * Include file Image/Graph/Marker.php
 */
require_once 'Image/Graph/Marker.php';

/**
 * Data marker as circle (require GD2)
 *
 * @category   Images
 * @package    Image_Graph
 * @subpackage Marker
 * @author     Jesper Veggerby <pear.nosey@veggerby.dk>
 * @copyright  Copyright (C) 2003, 2004 Jesper Veggerby Hansen
 * @license    http://www.gnu.org/copyleft/lesser.html  LGPL License 2.1
 * @version    Release: 0.7.2
 * @link       http://pear.php.net/package/Image_Graph
 */
class Image_Graph_Marker_Circle extends Image_Graph_Marker
{

    /**
     * The 'size' of the marker, the meaning depends on the specific Marker
     * implementation
     * @var int
     * @access private
     */
    var $_size = 10;

    /**
     * Draw the marker on the canvas
     *
     * @param int $x The X (horizontal) position (in pixels) of the marker on
     *   the canvas
     * @param int $y The Y (vertical) position (in pixels) of the marker on the
     *   canvas
     * @param array $values The values representing the data the marker 'points' to
     * @access private
     */
    function _drawMarker($x, $y, $values = false)
    {
        $this->_getFillStyle();
        $this->_getLineStyle();

        $dA = 2*pi()/($this->_size*2);
        $angle = 0;
        while ($angle < 2*pi()) {
            $this->_canvas->addVertex(array('x' =>
                $x + $this->_size*cos($angle), 'y' =>
                $y - $this->_size*sin($angle)
            ));
            $angle += $dA;
        }

        $this->_canvas->addVertex(array('x' =>
            $x + $this->_size*cos(0), 'y' =>
            $y - $this->_size*sin(0)
        ));

        $this->_canvas->polygon(array('connect' => true));

        parent::_drawMarker($x, $y, $values);
    }

}

?>
